Licensing GLScene 

GLScene is distributed under Mozilla Public Licence (MPL 2.0), which means, in short, 
that it is free for both freeware and commercial use. 
The code is still copyrighted (in that it isn't public domain), but you can use it in products with closed or open-source freely. 
The only requirements are:
Acknowledge GLScene is used somewhere in your application (in an about box, credits page or printed manual, etc.
with at least a link to http://glscene.org or https://github.com/glscene)
Modifications made to GLScene units must be made public (no need to publish the full code, 
only to state which parts were altered, and how), but feel welcome to open-source your code.
Some units, API headers and DLLs are included in the GLScene package for convenience 
but are not part of GLScene, may use different licensing scheme and have different copyright owners, 
such files have an explicit notice attached to them or placed in their directory.

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GLS Team